"^^^ THE NEW EVOLUTION '^^^^ 



sucking up the water. The males of the light and 

 deep orange types will not visit mud, and are much 

 swifter, higher and stronger fliers. Giants and curi- 

 ous little dwarfs are found in all the forms. 



In the yellow form one-quarter of the females are 

 pure white, with the black borders of the usual yellow 

 females. In the north these white females never 

 occur in spring, being found only in the summer. In 

 the south they occur equally both in spring and sum- 

 mer. In the deep orange form white females are in- 

 frequent, and in the light orange form they are still 

 less common. In the yellow form which is faintly 

 flushed with orange apparently the females are 

 never white. 



So far as I have seen mating takes place only be- 

 tween butterflies of the same color type. The young 

 produced may be of the same color type as the par- 

 ents, or of a different color type, or of two or more 

 color types. 



But in some localities this extraordinary butterfly 

 shows only most insignificant variations, and some 

 of its closest relatives are almost invariable. 



A few butterflies exist in two quite different sizes 

 between which intermediates are rare, at least in most 

 localities. This is the case, for instance, in our com- 

 mon tailed blue. In many butterflies sporadic giants 

 and dwarfs differing abruptly in size and more or less 

 in habits from the normal type are not infrequent. 



In many butterflies there is a regular alternation of 

 forms from one season to the next. Thus in our com- 

 mon eastern angle-wings the summer individuals are 



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